US3684905A — Piezoelectric crystal device including loading el…

Claim 1

Independent Claim 88 words

A piezoelectric crystal device comprising a body member having two parallel, planar, opposing surfaces each surface having disposed thereon, a metallic electrode of a first thickness, two metalliC mechanical loading elements of a second thickness greater than said first thickness, said two mechanical loading elements being on opposite sides of and equidistant from a line which cuts the area of the surface on which said two loading elements are disposed in half, each of said loading elements being in the shape of a chordal section of a circle.

Claim 2

Dependent Claim 88 words

A piezoelectric crystal device comprising a body member having two parallel, planar, opposing surfaces each surface having disposed thereon, a metallic electrode of a first thickness, two metalliC mechanical loading elements of a second thickness greater than said first thickness, said two mechanical loading elements being on opposite sides of and equidistant from a line which cuts the area of the surface on which said two loading elements are disposed in half, each of said loading elements being in the shape of a chordal section of a circle.

Claim 3

Dependent Claim 137 words

A piezoelectric crystal device having a body member comprised of two opposite, parallel, planar, circular surfaces, the area of one surface being bounded by the area of the other surface, each surface having disposed thereon an electrode element and a plated metallic loading element, said electrode element being of a first thickness and said loading element being of a second thickness greater than said first thickness, each loading element being in the shape of a chordal section of the circle defined by the edge of one of said circular surfaces and being positioned on the edge of its respective surface so that its circular edge is flush with the edge of said respective surface, the area of each loading element on each surface being bounded by the area of the other loading element on the opposite surface.

Claim 4

Dependent Claim 137 words

A piezoelectric crystal device having a body member comprised of two opposite, parallel, planar, circular surfaces, the area of one surface being bounded by the area of the other surface, each surface having disposed thereon an electrode element and a plated metallic loading element, said electrode element being of a first thickness and said loading element being of a second thickness greater than said first thickness, each loading element being in the shape of a chordal section of the circle defined by the edge of one of said circular surfaces and being positioned on the edge of its respective surface so that its circular edge is flush with the edge of said respective surface, the area of each loading element on each surface being bounded by the area of the other loading element on the opposite surface.

Claim 5

Dependent Claim 141 words

A piezoelectric crystal device having a body member comprised of two opposite, parallel, planar, circular surfaces, each surface having disposed thereon an electrode element and a plated metallic loading element spaced from the electrode element, said electrode element being of a first thickness and said loading element being of a second thickness greater than said first thickness, each loading element further being in the shape of a chordal section of the circle defined by the circular edge of one of said circular surfaces, and being positioned so that its circular edge is flush with the circular edge of the circular surface on which it is disposed, each electrode element further being geometrically shaped to have an angular corner and being positioned so that a line passing through and bisecting said angular corner is perpendicular to the chord of said chordal section.

Claim 6

Dependent Claim 141 words

A piezoelectric crystal device having a body member comprised of two opposite, parallel, planar, circular surfaces, each surface having disposed thereon an electrode element and a plated metallic loading element spaced from the electrode element, said electrode element being of a first thickness and said loading element being of a second thickness greater than said first thickness, each loading element further being in the shape of a chordal section of the circle defined by the circular edge of one of said circular surfaces, and being positioned so that its circular edge is flush with the circular edge of the circular surface on which it is disposed, each electrode element further being geometrically shaped to have an angular corner and being positioned so that a line passing through and bisecting said angular corner is perpendicular to the chord of said chordal section.

Claim 7

Dependent Claim 49 words

A piezoelectric crystal device as recited in claim 3 wherein each electrode element is further geometrically shaped to have two additional angular corners and is positioned so that a line passing through said two additional angular corners is perpendicular to said line passing through and bisecting said angular corner.

Claim 8

Dependent Claim 27 words

A piezoelectric crystal device as recited in claim 4 wherein each electrode element is positioned approximately in the center of the surface on which it is disposed.

Claim 9

Dependent Claim 50 words

A piezoelectric crystal device as recited in claim 5 further including a metallic tab extending from each electrode in the direction of said line passing through and bisecting said angular corner, to a point on the edge of each circular surface, said loading elements further being plated over said tabs.

Claim 10

Dependent Claim 59 words

A piezoelectric crystal device as recited in claim 6 wherein said crystal is an A-T cut crystal and wherein said line passing through and bisecting said angular corner is in the direction of the Z-axis of the crystal and wherein said line passing through said two additional angular corners is in the direction of the X-axis of the crystal.

Claim 11

Dependent Claim 27 words

A piezoelectric crystal device as recited in claim 6 wherein each loading element is spaced from each electrode element a distance between 0.001 inch and 0.01 inch.

Claim 12

Dependent Claim 103 words

A piezoelectric crystal device as recited in claim 7 further including an additional metallic loading element being plated on each surface, each additional loading element being in the shape of a chordal section of the circle defined by the edge of one of said circular surfaces and being positioned so that its circular edge is flush with the circular edge of the circular surface on which it is disposed and so that the loading elements on each surface are located on opposite sides of and equidistant from a line running through the center of each circular surface in the direction of the X-axis.

Claim 13

Dependent Claim 48 words

A piezoelectric crystal deVice as recited in claim 9 wherein said point on the edge of one of the circular surfaces that one of said tabs extends to is 180* removed from the point on the other of said surfaces that the other of said tabs extends to.

Claim 14

Dependent Claim 34 words

A piezoelectric crystal device as recited in claim 10 wherein said electrodes are aluminum having a thickness of about 10 A.U. and said loading elements are silver having a thickness of about 120 A.U.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1975-08-15	1976-02-14	1976-08-15	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1979-08-15	1980-02-14	1980-08-15	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1983-08-15	1984-02-14	1984-08-15	$7700.00	Window Closed / Lapsed

Piezoelectric crystal device including loading elements having the shape of chordal sections

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